package com.hmdp.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.mapper.ShopMapper;
import com.hmdp.service.IShopService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.CacheClient;
import com.hmdp.utils.RedisData;
import com.hmdp.utils.SystemConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.geo.Distance;
import org.springframework.data.geo.GeoResult;
import org.springframework.data.geo.GeoResults;
import org.springframework.data.redis.connection.RedisGeoCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.domain.geo.GeoReference;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private CacheClient cacheClient;
    @Override
    public Result queryById(Long id) {
        //设置空值解决缓存穿透CachePenetration问题
        Shop shop = cacheClient.queryNullCachePenetration(CACHE_SHOP_KEY, id, Shop.class,
                this::getById, CACHE_SHOP_TTL, TimeUnit.MINUTES);
        //设置逻辑过期解决缓存击穿问题
        Shop shop1 = cacheClient.queryLogicalCacheBreakdown(CACHE_SHOP_KEY, id, Shop.class,
                this::getById, CACHE_SHOP_TTL, TimeUnit.MINUTES);
        Shop shop2 = cacheClient.querySynchronizedCacheBreakdown(CACHE_SHOP_KEY, id, Shop.class,
                this::getById, CACHE_SHOP_TTL, TimeUnit.MINUTES);
        Shop shop3 = cacheClient.querySetIfAbsentCacheBreakdown(CACHE_SHOP_KEY, id, Shop.class,
                this::getById, CACHE_NULL_TTL, TimeUnit.MINUTES);

        return Result.ok(shop);
    }
    /**
     * 更新商铺信息
     * @param shop 商铺数据
     * @return 无
     */
    @Override
    @Transactional
    public Result update(Shop shop) {
        if(shop.getId() == null){
            return Result.fail("店铺id不能为空");
        }
        //写入数据库
        updateById(shop);
        //删除缓存
        stringRedisTemplate.delete(CACHE_SHOP_KEY + shop.getId());
        return Result.ok();
    }
    /**
     * 根据商铺类型分页查询商铺信息
     * @param typeId 商铺类型
     * @param current 页码
     * @param x 经度
     * @param y 纬度
     * @return 商铺列表
     */
    @Override
    public Result queryShopByType(Integer typeId, Integer current, Double x, Double y) {
        //1.不需要根据坐标查询
        if(x==null||y==null){
            //1.1根据类型分页查询
            Page<Shop> page = query()
                    .eq("type_id", typeId)
                    .page(new Page<>(current, SystemConstants.DEFAULT_PAGE_SIZE));
            //1.2返回数据
            return Result.ok(page.getRecords());
        }
        //2.需要根据坐标查询
        //2.1计算分页参数
        int from = (current - 1) * SystemConstants.DEFAULT_PAGE_SIZE;
        int end = current * SystemConstants.DEFAULT_PAGE_SIZE;
        //2.2查询redis按照距离排序、分页
        String key = SHOP_GEO_KEY+typeId;
        GeoResults<RedisGeoCommands.GeoLocation<String>> results = stringRedisTemplate.opsForGeo()
                .search(key,
                        GeoReference.fromCoordinate(x, y),
                        new Distance(5000),
                        RedisGeoCommands.GeoSearchCommandArgs.newGeoSearchArgs().includeDistance().limit(end));
        if(results==null){
            return  Result.ok();
        }
        //从0-end,需要从from到end进行截取
        List<GeoResult<RedisGeoCommands.GeoLocation<String>>> list = results.getContent();
        if(list.size()<=from){
            //没有下一页数据
            return Result.ok();
        }
        List<Long> ids = new ArrayList<>(list.size());
        Map<String, Distance> distanceMap = new HashMap<>(list.size());
        list.stream().skip(from).forEach(result->{
            //获取店铺id
            String shopIdStr = result.getContent().getName();
            ids.add(Long.valueOf(shopIdStr));
            Distance distance = result.getDistance();
            distanceMap.put(shopIdStr,distance);
        });
        //2.3根据id查询店铺信息
        String idsStr= StrUtil.join(",", ids);
        List<Shop> shops = query().in("id", ids).last("ORDER BY FIELD(id," + idsStr + ")").list();
        for(Shop shop:shops){
            shop.setDistance(distanceMap.get(shop.getId().toString()).getValue());
        }
        return Result.ok(shops);
    }
}
